Process of making files



Patented ot. 18, 1927.

q UNITE-D "sTA TE S PATENT'jOFF'IC-.

. DOUARD LCOENEN, onnRU'ssEns. BELGIUM.

eppi'icationmea March 6,1924'. serial No.

This invention has lfor l.its object to pro-l vide an improved `process for the manufac-` ture vof files ofthe typel composed of a plurality of file blades arranged side-by side and fastened together. In the known files constructed on this principle the fasteningv together of .the tile bladesis 'effected by mechanical means.` The n to be feared. If, on the other hand, the inblades are mounted side by'si'de on' a central `support or bar and are held in place `by nuts orother clamping devices. It has-already been proposed for the same purpose to clamp 4the blades in a frame or holder with the use All those con-'- of similar `fastening means. structions have 'however the ldrawback that they d0V not assure a suthcient degree ofrigidityvof the file as a whole in working be- -causeth'e several blades have a tendency toV move relatively Ato one another.' F urthe'r, p the supports and the fastening devices are generally of complicated form and increase considerably the weight of the liles, while presenting certain. difficulties as regards labor, and the manipulations ofthe files.

It has lalreadyV been proposed to connect vthe individual'tile andblades with asupporting elementby means of welding.

The proximity of .the individua blades,

however, prevents complete welding. As a result the blades only withstand large stresses with difficulty and tracture'sareV ever dividual blades bel removed so as to facilitate the v',welcling, such liley .may be particularly examplepfor` sharpening swords, while ble-` ingl quite unfitfor use for finer work.

YThe purpose ofthis invention is to overi come these defects byv anew method o manufacture, in which the individual file blades are connected ,together by fusion welding,"'tl1us providingav rigidity which is not inferior to that of ordinary files made of one piece material; and this is done by arneous metal spread in a molten state upon the V K to the grooves.l adapted for use forspe'cial purposes, vas for 697,333, and in Belgium January. 14, 192i.l

backs of the blades to be assembled. vr.This layer of metal vwhen cooled will vconstitute a solid'base whichserves asa connecting element between the several blades of the file.

- In this case the blades may be arranged morey orv less closely/together. Further,.-the,invention allows Lof producing lilesf ot' comparatively great width which are, subsequently sawn or separated in the direction of their lengthi'orthe purpose of obtain- Y ing-from one wide tile a plurality of'files of llesser wid-th. f

Other advantages of the improved file according tothis inventioniwillbe. perceived from the following description with-.reference to the accompanying drawings which Villustrate by way'of-examplela constructional `form of this invention.v Y

- Fig. l illustrates a metal bar that is cut-up to form the blades. y

Fig. 2 is a cross section offthlis bar taken on line 2 2 of Fig.. 1. f

Fig. 3 is aA perspective view of one ofthe tile blades ready-fori fusion welding. f

Fig.4 is aperspectiveviewlof the mold in whichV the file blades are fusion `welded together. N f i l Fig. 5 illustratesonel of the Vvways of attaching the tang to ithefile.

Fig. 6 is a bottom view -of-the improved l le after the fusion welding operation.`

F ig. Y7 is a vertical'cross-section of the file taken on line 7-7 of. Fig. A(hat right angles The file blades 1 'which are Vfusion welded together are'cutfto the desired lengths from asteel bar having a cross-'section corresponding to thatvof the blades when ready for use.

:The tilebladeshave preferably an operative'fface 2 comprising vertical grooves. 'The adj acent'kv operating-[face 3y isI inclined -so that the contact ledge -shall have the form' of a saw-'toothlor planing cutter. f

the illustrated `examplefthefile blades arearra'nged at an angle of about 30 vvto the longitudinal axis of the ile so that all the cross sections of the file shall intersect the ksame number of tile blades. This arrangement enables the improved file to have a. regular cutting action upon metal parts, even in the case where the latter are of small thickness, without producing jolts or stopl pages during the operation, because the number of bearing points of the file is always the saine.

Figs. 4 and 5 illustrate one of the processes with vertical grooves "luponf the support.:

f without it being necessary to of the faces `2.

ofmanufactureof the improvedlfile of this! invention, f

The supportV comprises a part 5 formed 6 in which file blades 1 are inserted. These grooves make ,with the longitudinal axis of the""suppo`1t"`the same angle as the blades make with the major axis of the finished file. i

The blades are held in position during the Y fusion welding operation, by means of a fusion welded" by automoved, and the central portion 9 is filled with the fusingin metall'rThe file is then 'machined on its side' surfaces so asto` assume the form shown in Fig. 5.

The tang 10constituted by a piece of metal bf suitable sha-pe is then .connected by fusion welding to the end of the' file, the connec-y tionlzbeiiig` effected by `means `of extraneous metal. After this operation-thefile'is hard- *Eened and ready forV use;v

It is obvious that a tang or fangsl 10 may be arranged onL the "support together with the blades, so that the wholeA can be fusion i' welded at one and the same time.`

Bythis means, the improved le is made in one piece and the blades have grooves between th'emof 4great depth, thereby enabling the file tobesharpened several times.

:The sharpening is effected when theopera` tive faces 3.ofthe'blades have become worn,

The vimproved process allows of producing in asingle mold, files of comparatively great Width, and these files can be sawn inthe di= Mrectionv of the length of theVA edges ofA desired widths which may be"very;'ismall, in fact, so

small asto produce a fi aving a shapelapproximating that of a metal-cutting saw.

NVhatI claim as my to secure `byLetters Patent is Y 1. A process for the manufacture of files,

. comprising arranging aplurality of file .bladesside by side on asupport, and then connecting the blades Vtogether by fusion y f invention and desire to provideV a'file recut the teeth` welding so as 'to 'provide a file formed in one Y ""pie'ce "bodywhereof the fusingiin metalY forms the ofthe file, the fusion welding being performed first along the two sides of the supporting member, and then, after removal tofthe-supportin fl member, on the surface that wascovered y suoli member.V

25A 'process for the manufacture of files, comprising arranging a fplurality of file blades side by side on asuppor'ttogether with the metal whichis toconstitute the tang of the finished file, .and then connecting together the various parts by` "fusion welding VSo as formed yin one piece whereof the fusing in metal'forms the body of'thele,

the fusion welding` being performed V4first 'alongthe two sides ofthe supporting"meinsY yber, and then, after removal of the supportf ingV member, on the surfacethat was covered,

'by-such membenf v ,Y

3. Aprocess for the` manufacture of; files, comprising arranging a` plurality of file blades sideb side on a support, and then connecting` t e blades -together by? fusion fwelding so asto provide a file formed in vone piece whereof the fusing in metalforms the ybody of the file, the support having a bottom containing vertical grooves into which the file `blades are inserted, and a sul'iporting i member for holding the blades in position un- .til theseveral tile blades are connected together bythe fusion. welding, the fusion welding being ,performed first along' the two sides of the supporting member, and! then, after removal of the supporting member, on the surfacethat was coveredby such member.

4. A `process forthe manufacture of files,

i comprising arranging a` plurality of" file blades side b sidefon a support together with the metal, w ichiis to. constitute'the tang of the finished file, and thenconnecting'together the various partsby fushionwelding so as to `provide a file ,formed in one piece whereof the fusing iin 4metal forms the :body "of the file, the' support having a *bottomY containing vertical grooves into which the'ffile blades are inserted, and a supportingmember for .holding` the bladesin position untilthe several fileblades are connected together by the fusion welding, the fusion y welding being performed first along the two sides of the supporting member, and then, afterfremoval of the, supporting member, on the "surface that was covered by such member.` g f j In testimonywhereof I'aiiix my signature. EDOUARD C QENENn 

